a Mystery

Hii
my real names kean, I live in australia and I have a friend who I met online when playing online games. She is 15, turning 16 soon and vomits blood monthly sometimes even more and is becoming more frequent, she has known of this happening ever since she can remember and has been asking her mum what was causing it. But her mum wont tell her. I'm worried whether she is in a serious condition or not and if anyone can tell me what her condition is it'd be great.

She ussually passes out as soon as she vomits so she doesn;t remember much of what happens, and she has maids and butlers looking after her. She lives with her aunty and uncle and moves around alot so she has never had any friends that have stayed with her for long and is seperated from the other children, and her mum doesn;t visit her much... She's writing a book now(i dont know what on since she doesn;t say except its a true story and sad) and trying to finish it in one mnth(+she writes it at night... Makes me worry even more) even though she plans on writing about 10 chapters and she's also giving away her stuff in the online game which is really worrying me since she worked so hard to get them...

I went to my local hospital and asked a random nurse that was free, she wouldn't answer me properly since she doesn;t know the details but said the common causes for vomitting blood are cancer and ulsers in the inside of her internal organs... Which I have a question... Can yu be born with cancer? Or maybe its a birth defect and got "bad wiring"

if yu know of a disease/sickness that causes yu to vomit blood please make a list. I'm trying to find out what it is because she is really scaring me... And I dont think she deserves to go over to the other world yet ;_;

all I know so far is that causes yu to vomit blood periodically

leukaemia(not sure if yu can get it at birth>_<")
ulcers (somewhere from her stomach to eosophagus) ->shouldn;t ulcers heal eventually?
Cancer(somewhere from her stomach to eosophagus)

she has had operations before but hasnt been told the details about them... She asked me once "do yu think its serious? When the doctors and mamma wont tell me whats wrong with me?" and talks like she wont live to see her 18th birthday...

In the us are there laws about not being told by a doctor whats wrong with yu... She's nearly 16, has enough common sense and I just cant figure out why the doctors wont tell her what it is. Sure it will be a shock but its still better to know then not to know... If yu ever understand the angst and curiousity I thinks its more painful not knowing then knowing...